Chin-Hua Lin and You-De Chen explored and have adapted the traditional Chinese mortise and tenon technique in connecting wood method in the ‘burr puzzle’ stool. The main principle of a ‘burr puzzle’ is assembling wood pieces in specific order and limiting each of the pieces movement only by the notches of the wood, which eventually creates a firm and solid connection. The entire 42 x 54 x 82 cm stool is assembled only using the metal mortises.